@incollection{Barmpalias2003MonotonicComputabilitySemi,
  year      = 2003,
  publisher = {Springer},
  pages     = {290--300},
  author    = {X. Zheng and G. Barmpalias},
  title     = {On the Monotonic Computability of Semi-computable Real Numbers},
  booktitle = {Discrete Math. Theor. Comput. Sci.},
}